# Practice Test: Question Set - 13

**1. The time of flight (**

*t*) of a projectile on a horizontal plane is given by- (A)

*t =*2

*u. sinα/g*

- (B)

*t =*2

*u. cosα/g*

- (C)

*t =*2

*u. tanα/g*

- (D)

*t =*2

*u/g.sinα*

**2. Which of the following is not the unit of distance?**

- (A) Angstrom

- (B) Light year

- (C) Micron

- (D) Milestone

**3. Two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are**

- (A) 15 N and 5 N

- (B) 20 N and 5 N

- (C) 15 N and 15
N

- (D) None of
these

**4. Which of the following are vector quantities?**

- (A) Linear
displacement

- (B) Linear
velocity

- (C) Linear
acceleration

- (D) All
of these

**5. Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then**

- (A) Their
algebraic sum is zero

- (B) Their
lines of action are at equal distances

- (C) The
algebraic sum of their moments about any point in their plane is zero

- (D) The
algebraic sum of their moments about any point is equal to the moment of their
resultant force about the same point

**6. The possible loading in various members of framed structures are**

- (A) Compression or
tension

- (B) Buckling or shear

- (C) Shear or tension

- (D) All of the above

**7. The acceleration of a particle moving with simple harmonic motion is __________ at the mean position.**

- (A) Zero

- (B) Minimum

- (C) Maximum

- (D) None of
these

**8. Efficiency of a screw jack is given by (where α = Helix angle, and φ = Angle of friction.)**

- (A)

*tan(α*+

*φ)/tanα*

- (B)

*tanα/tan (α*+

*φ)*

- (C)

*tan(α*-

*φ)/tanα*

- (D) None of
these

**9. The force induced in the string**

*AB*due to the load*W*, as shown in the below figure is- (A)

*W*

*sinθ*

- (B)

*W*

*cosθ*

- (C)

*W*

*secθ*

- (D)

*W*

*cosecθ*

**10. The unit of work or energy in S.I. units is**

- (A) Newton

- (B) Pascal

- (C) Watt

- (D) Joule

**11. The velocity ratio for the first system of pulleys is (where**

*n*is the number of pulleys.)- (A)

*n*

- (B)

*n²*

- (C) 2

^{n}- (D) 2

*- 1*

^{n}**12. If a number of coplanar forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.**

- (A) Equal to

- (B) Less than

- (C) Greater than

- (D) None
of these

**13. Center of gravity of a thin hollow cone lies on the axis at a height of**

- (A) One-fourth of the
total height above base

- (B) One-third of the
total height above base

- (C) One-half of the total
height above base

- (D) Three-eighth of the
total height above the base

**14. Which of the following statement is correct in connection with projectiles?**

- (A) A path,
traced by a projectile in the space, is known as trajectory.

- (B) The
velocity, with which a projectile is projected, is known as the velocity of
projection.

- (C) The angle,
with the horizontal, at which a projectile is projected, is known as angle of
projection.

- (D) All of the
above

**15. A pendulum which executes one beat per second is known as**

- (A) Simple
pendulum

- (B) Compound
pendulum

- (C) Torsional
pendulum

- (D) Second's
pendulum

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